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SIP Callflow Examples PDF Print E-mail
Written by Hemanshu Patel   
Thursday, 08 November 2007
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SIP Callflow Examples
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Page 17 of 17
3.11. Unsuccessful Temporarily Unavailable

Alice Proxy 1 Proxy 2 Bob
| | | |
| INVITE F1 | | |
|--------------->| INVITE F2 | |
| 100 F3 |--------------->| INVITE F4 |
|<---------------| 100 F5 |--------------->|
| |<---------------| 180 F6 |
| | 180 F7 |<---------------|
| 180 F8 |<---------------| |
|<---------------| | 480 F9 |
| | |<---------------|
| | | ACK F10 |
| | 480 F11 |--------------->|
| |<---------------| |
| | ACK F12 | |
| 480 F13 |--------------->| |
|<---------------| | |
| ACK F14 | | |
|--------------->| | |
| | | |


In this scenario, Bob initially sends a 180 Ringing response to
Alice, indicating that alerting is taking place. However, then a
480 Unavailable is then sent to Alice. This response is
acknowledged then proxied back to Alice.

Message Details

F1 INVITE Alice -> Proxy 1

INVITE sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
Route: <sip:ss1.atlanta.example.com;lr>
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Proxy-Authorization: Digest username="alice",
realm="atlanta.example.com",
nonce="aa9311cf5904ba7d8dc3a5ab253028fa", opaque="",
uri="sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it ",
response="59a46a91bf1646562a4d486c84b399db"
Content-Type: application/sdp
Content-Length: 151

v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=-
c=IN IP4 192.0.2.101
t=0 0
m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000

/*Client for Alice prepares to receive data on port 49172 from the
network.*/


F2 INVITE Proxy 1 -> Proxy 2

INVITE sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.example.com;lr>
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Content-Type: application/sdp
Content-Length: 151

v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=-
c=IN IP4 192.0.2.101
t=0 0
m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000


F3 100 Trying Proxy 1 -> Alice

SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Content-Length: 0


F4 INVITE Proxy 2 -> Bob

INVITE sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0
Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
Max-Forwards: 68
Record-Route: <sip:ss2.biloxi.example.com;lr>,
<sip:ss1.atlanta.example.com;lr>
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Content-Type: application/sdp
Content-Length: 151

v=0
o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com
s=-
c=IN IP4 192.0.2.101
t=0 0
m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000


F5 100 Trying Proxy 2 -> Proxy 1

SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Content-Length: 0


F6 180 Ringing Bob -> Proxy 2

SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1
;received=192.0.2.222
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
Record-Route: <sip:ss2.biloxi.example.com;lr>,
<sip:ss1.atlanta.example.com;lr>
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Content-Length: 0


F7 180 Ringing Proxy 2 -> Proxy 1

SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
Record-Route: <sip:ss2.biloxi.example.com;lr>,
<sip:ss1.atlanta.example.com;lr>
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Content-Length: 0


F8 180 Ringing Proxy 1 -> Alice

SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
Record-Route: <sip:ss2.biloxi.example.com;lr>,
<sip:ss1.atlanta.example.com;lr>
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >
Content-Length: 0


F9 480 Temporarily Unavailable Bob -> Proxy 2

SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1
;received=192.0.2.222
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Content-Length: 0


F10 ACK Proxy 2 -> Bob

ACK sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0
Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1
Max-Forwards: 70
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 ACK
Content-Length: 0


F11 480 Temporarily Unavailable Proxy 2 -> Proxy 1

SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Content-Length: 0


F12 ACK Proxy 1 -> Proxy 2

ACK sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 ACK
Content-Length: 0


F13 480 Temporarily Unavailable Proxy 1 -> Alice

SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 INVITE
Content-Length: 0


F14 ACK Alice -> Proxy 1

ACK sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0
Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70
From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl
To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159
Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Proxy-Authorization: Digest username="alice",
realm="atlanta.example.com",
nonce="aa9311cf5904ba7d8dc3a5ab253028fa", opaque="",
uri="sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it ",
response="59a46a91bf1646562a4d486c84b399db"
CSeq: 1 ACK
Content-Length: 0



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